a simple google search or visit to an app provider's website can verify if it is legit. another great option, the find my iphone app. i showed dominique williams blair how it works. we are going to leave my phone here at the bar. we're going to leave and use find my iphone to see if we can pinpoint back here. now, we figured out we left the phone at the bar. now, the question is, does the app work to help us find it. we are going to fire up the app. is this where we are? >> yes. >> that is where we are. it looks like the app actually is pretty accurate. you can do a couple of things like send some sounds to it so you can hear it. you can also send a text message. even funny men, like chuck knight, want to make sure their jokes and personal information are protected. >> i'm paranoid. i feel like will smith in that movie where the government is sneaking around and the only person that can help me is gene hackman but i don't know him, mario. what am i supposed to do? >> reporter: one app from lookout provides a full service security operation. it checks your phone for virus